US6563480B1 - LED display panel having a memory cell for each pixel element - Google Patents
LED display panel having a memory cell for each pixel element Download PDFInfo
- Publication number
- US6563480B1 US6563480B1 US09/175,771 US17577198A US6563480B1 US 6563480 B1 US6563480 B1 US 6563480B1 US 17577198 A US17577198 A US 17577198A US 6563480 B1 US6563480 B1 US 6563480B1
- Authority
- US
- United States
- Prior art keywords
- display panel
- data
- memory cell
- light emitting
- display
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 8
- 239000003086 colorant Substances 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims 3
- 150000004706 metal oxides Chemical class 0.000 claims 3
- 239000004065 semiconductor Substances 0.000 claims 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000003915 cell function Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0857—Static memory circuit, e.g. flip-flop
Definitions
- the present invention relates to a light emitting diode (LED) display panel having a memory cell for each pixel and, more particularly, to a LED display panel for use as a graphic display panel of a personal computer system.
- LED light emitting diode
- a conventional graphic display panel of a personal computer system is generally provided with an associated VRAM.
- a graphic controller in the graphic display panel reads image data directly from the VRAM, converts the same to display data in a display format and writes the display data to each pixel element at a high speed, the image data being supplied from a processor of the computer system prior to the read operation by the graphic controller.
- the graphic controller iteratively reads the image data from the VRAM to allow the display data in each pixel to coincide with a corresponding one of the latest image data supplied from the processor. This iterative read-out of the image data by the graphic controller reduces the work time of the controller for the graphic operation on the display panel, thereby reducing the speed of the graphics.
- a sufficient standard is not provided for a flat display panel such as a LED display panel or a liquid crystal panel.
- the design for a graphic controller used for a display panel is generally changed depending on the design for the display panel, and accordingly, the cost of the graphic controller rises, which in turn raises the cost of the graphic display panel.
- the present invention provides a LED display panel comprising: a pixel array including a plurality of pixel elements arranged in a matrix along a row direction and a column direction, a plurality of word lines each disposed for a corresponding row of the pixel elements, and a bit line each disposed for a corresponding column of the pixel elements, each of the pixel elements having a LED and an associated memory cell,; an address port for receiving an address signal including a row address and a column address; a row address decoder for receiving the row address from the address port to specify one of the word lines; a column address decoder for receiving the column address from the address port to specify one of the bit lines; and a buffer for writing image data through the specified bit line to one of the memory cells corresponding to the specified word line, an output of the memory cell controlling the associated LED.
- a higher-speed operation, reduction in the occupied area and the fabrication cost can be obtained because a video RAM is not provided separately from the LED display panel and refreshment operation by a video controller of the LED display panel is not needed.
- FIG. 1 is a block diagram of a LED display panel according to an embodiment of the present invention.
- FIG. 2 is a block diagram of the arrangement of pixel elements of the LED display panel of FIG. 1;
- FIG. 3 is a block diagram of each pixel element shown in FIG. 2 .
- a LED display panel has a display panel implemented by a pixel array 11 including an array of pixel elements for displaying image data on the display panel, a driver section 12 for controlling the array of the pixel elements, and an input/output buffer 13 for writing/reading data to/from the array of pixel elements.
- the LED display panel includes a plurality of (M ⁇ N) pixel elements 21 arranged in a matrix along a row (horizontal) direction and a column (vertical) direction, a plurality of (M) word lines 22 each corresponding to a row of the pixel elements 21 , a plurality of (N) bit lines 23 each corresponding to a column of the pixel elements 21 .
- the driver section 12 includes an address port 14 for receiving address signals and address control signals, a row address decoder 15 for receiving row address signals of the address signals from the address port 14 to activate one of the word lines 22 , a column decoder 16 for receiving the column address signals of the address signals to activate one of the bit lines 23 .
- the input/output buffer 13 receives a control signal for selecting a write mode or a read mode of the input buffer 13 .
- the input/output buffer transmits an input image data from the processor to the pixel array 11 after conversion of the image data to display data in a display format during the write mode.
- the input/output buffer transmits display data from the pixel array 11 to the processor after conversion of the display data to image data in a computer format during the read mode.
- the read mode is generally used for storing the image data used for displaying the image in a data file.
- each pixel element 21 has a memory cell 31 for storing display data therein, a MOS transistor 32 having a gate controlled by an output line 33 of the memory cell 31 , and a LED 34 controlled by the MOS transistor 32 for emitting light based on the data stored in the memory cell 31 .
- Each write data is supplied through a bit line 23 , which is specified by a column address, to the memory cell 31 corresponding to the specified bit line 23 and a word line 22 selected by the row address.
- the memory cell 31 may be a DRAM cell, SRAM cell, FRAM (ferroelectric RAM) cell or PROM cell.
- a page write operation may be used, similarly to an ordinary DRAM, by consecutively selecting bit lines 23 while selecting a single word line 22 .
- a SRAM cell is used as the memory cell 31
- the LED display panel operates at a higher speed.
- a FRAM cell is used as the memory cell 31
- the display data is maintained on the LED display panel after the LED display panel is switched off. This allows the display data on the display panel to be stored in a data file outside the display panel.
- a PROM cell is used as the memory cell 31 , the LED display panel is preferably used for advertisement, wherein the data stored in the PROM is changed or modified for adapting the display data to a new version of the advertisement. If the LED display panel of the embodiment is to be used for displaying color images, different LEDs are used in combination for displaying three primary colors in each spot.
- a processor delivers an ordinary VRAM address signal to the address port 14 , which transfers a row address to the row address decoder 15 and a column address to the column address decoder 16 , thereby selecting a word line 22 and a bit line 23 corresponding to a specified pixel element 21 .
- Input write data is delivered through the input/output buffer 13 and the selected bit line 23 to the memory cell 31 of the specified pixel element 21 , which stores the write data therein. If the input write data is “1”, the memory cell 31 activates the MOS transistor 32 to allow the corresponding LED 34 to emit light. If the write data is “0”, the memory cell 31 inactivates the MOS transistor 32 to allow the corresponding LED 34 to turn off.
- a read operation from the LED display panel is conducted by specifying a pixel element 21 , similarly to the write operation, and controlling the input/output buffer 13 to operate in a read mode by selecting a read mode.
- each LED 34 is associated with a corresponding memory cell 31 storing display data in the pixel element 21 .
- the video controller and the address decoder in the conventional LED display panel can be unified. Further, the LED display panel of the present embodiment can operate at a higher speed.
Abstract
Description
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28728497A JP3533074B2 (en) | 1997-10-20 | 1997-10-20 | LED panel with built-in VRAM function |
JP9-287284 | 1997-10-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US6563480B1 true US6563480B1 (en) | 2003-05-13 |
Family
ID=17715411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/175,771 Expired - Lifetime US6563480B1 (en) | 1997-10-20 | 1998-10-20 | LED display panel having a memory cell for each pixel element |
Country Status (2)
Country | Link |
---|---|
US (1) | US6563480B1 (en) |
JP (1) | JP3533074B2 (en) |
Cited By (57)
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US20010007447A1 (en) * | 2000-01-11 | 2001-07-12 | Rohm Co., Ltd. | Display device and method of driving the same |
US20020018029A1 (en) * | 2000-08-08 | 2002-02-14 | Jun Koyama | Electro-optical device and driving method of the same |
US20020021295A1 (en) * | 2000-08-18 | 2002-02-21 | Jun Koyama | Liquid crystal display device and method of driving the same |
US20020021269A1 (en) * | 2000-08-07 | 2002-02-21 | Rast Rodger H. | System and method of driving an array of optical elements |
US20020021274A1 (en) * | 2000-08-18 | 2002-02-21 | Jun Koyama | Liquid crystal display device, method of driving the same, and method of driving a portable information device having the liquid crystal display device |
US20020024054A1 (en) * | 2000-08-18 | 2002-02-28 | Jun Koyama | Electronic device and method of driving the same |
US20020024485A1 (en) * | 2000-08-08 | 2002-02-28 | Jun Koyama | Liquid crystal display device and driving method thereof |
US20020036604A1 (en) * | 2000-08-23 | 2002-03-28 | Shunpei Yamazaki | Portable information apparatus and method of driving the same |
US20020039087A1 (en) * | 2000-10-02 | 2002-04-04 | Semiconductor Energy Laboratory Co., Ltd. | Self light emitting device and driving method thereof |
US20020041266A1 (en) * | 2000-10-05 | 2002-04-11 | Jun Koyama | Liquid crystal display device |
US20020047852A1 (en) * | 2000-09-04 | 2002-04-25 | Kazutaka Inukai | Method of driving EL display device |
US20020130828A1 (en) * | 2000-12-26 | 2002-09-19 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device, method of driving the same, and electronic device |
US20020167510A1 (en) * | 2001-05-08 | 2002-11-14 | Sanyo Electric Co., Ltd. | Display having memory in pixel part |
US20020175909A1 (en) * | 2001-05-23 | 2002-11-28 | Sanyo Electric Co., Ltd. | Display and method of controlling the same |
US20020180675A1 (en) * | 2001-05-30 | 2002-12-05 | Mitsubishi Denki Kabushiki Kaisha | Display device |
US20030020684A1 (en) * | 2001-07-26 | 2003-01-30 | Koninklijke Philips Electronics N.V. | Device comprising an array of pixels |
US20030025656A1 (en) * | 2001-08-03 | 2003-02-06 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method of driving thereof |
US20030048370A1 (en) * | 2001-09-07 | 2003-03-13 | Semiconductor Energy Laboratory Co., Ltd. | Electrophoresis display device and electronic equiptments |
US20030234755A1 (en) * | 2002-06-06 | 2003-12-25 | Jun Koyama | Light-emitting device and method of driving the same |
US20040156246A1 (en) * | 2002-09-18 | 2004-08-12 | Seiko Epson Corporation | Optoelectronic-device substrate, method for driving same, digitally-driven liquid-crystal-display, electronic apparatus, and projector |
US20040222955A1 (en) * | 2001-02-09 | 2004-11-11 | Semiconductor Energy Laboratory Co., Ltd. A Japan Corporation | Liquid crystal display device and method of driving the same |
US20040233225A1 (en) * | 2000-12-12 | 2004-11-25 | Philippe Guillemot | Digital video display device |
US20050083286A1 (en) * | 2000-07-03 | 2005-04-21 | Yasuyuki Kudo | Liquid crystal display device |
US20050190201A1 (en) * | 2002-07-23 | 2005-09-01 | Baer David A. | System and method for providing graphics using graphical engine |
US20050212740A1 (en) * | 2004-03-26 | 2005-09-29 | Semiconductor Energy Laboratory Co., Ltd. | Display device, driving method thereof, and electronic apparatus using the same |
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US20060139265A1 (en) * | 2004-12-28 | 2006-06-29 | Semiconductor Energy Laboratory Co., Ltd. | Driving method of display device |
US20060232600A1 (en) * | 2005-04-14 | 2006-10-19 | Semiconductor Energy Laboratory Co., Ltd. | Display device, driving method of the display device, and electronic device |
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US20060256055A1 (en) * | 2000-07-03 | 2006-11-16 | Yasuyuki Kudo | Liquid crystal display device |
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US20020021269A1 (en) * | 2000-08-07 | 2002-02-21 | Rast Rodger H. | System and method of driving an array of optical elements |
US20070139309A1 (en) * | 2000-08-08 | 2007-06-21 | Semiconductor Energy Laboratory Co., Ltd. | Electro-Optical Device and Driving Method of the Same |
US20020018029A1 (en) * | 2000-08-08 | 2002-02-14 | Jun Koyama | Electro-optical device and driving method of the same |
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US20020024485A1 (en) * | 2000-08-08 | 2002-02-28 | Jun Koyama | Liquid crystal display device and driving method thereof |
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